Hey have you ever looked into these https://www.amazon.com/gp/product/B005DKN20W/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1... they aren't too expensive and they don't use a lot of energy. I have one in my bathroom(half bath 3Lx6Wx10H) and had to get a thermostat plug in controller for it because it got so hot. $320 for 4 of them and only 400w each panel. I took two 1x2 cut to length of the panel then drove through some countersunk bolts from the back of the board so the threads would come out the front of the heater panel then got some little metal sleeves to fit over the bolt for spacers(the heater needs some space between the wall for the passive air flow) it helps to keep panel from bowing/cracking(ceramic) as it expands and contracts. Ran the boards across the top and the bottom because I needed to find studs but I'm sure they could be on the sides as well when you are driving into concrete.all depends on your climate, in my basement I do not need AC or chillers so huge cost savings right there. Although in winter growth slows to a crawl because the basement isn't heated.